LXR linux/net/tipc/node

   1/*
   2 * net/tipc/node_subscr.c: TIPC "node down" subscription handling
   3 *
   4 * Copyright (c) 1995-2006, Ericsson AB
   5 * Copyright (c) 2005, Wind River Systems
   6 * All rights reserved.
   7 *
   8 * Redistribution and use in source and binary forms, with or without
   9 * modification, are permitted provided that the following conditions are met:
  10 *
  11 * 1. Redistributions of source code must retain the above copyright
  12 *    notice, this list of conditions and the following disclaimer.
  13 * 2. Redistributions in binary form must reproduce the above copyright
  14 *    notice, this list of conditions and the following disclaimer in the
  15 *    documentation and/or other materials provided with the distribution.
  16 * 3. Neither the names of the copyright holders nor the names of its
  17 *    contributors may be used to endorse or promote products derived from
  18 *    this software without specific prior written permission.
  19 *
  20 * Alternatively, this software may be distributed under the terms of the
  21 * GNU General Public License ("GPL") version 2 as published by the Free
  22 * Software Foundation.
  23 *
  24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34 * POSSIBILITY OF SUCH DAMAGE.
  35 */
  36
  37#include "core.h"
  38#include "dbg.h"
  39#include "node_subscr.h"
  40#include "node.h"
  41#include "addr.h"
  42
  43/**
  44 * tipc_nodesub_subscribe - create "node down" subscription for specified node
  45 */
  46
  47void tipc_nodesub_subscribe(struct tipc_node_subscr *node_sub, u32 addr,
  48                       void *usr_handle, net_ev_handler handle_down)
  49{
  50        if (addr == tipc_own_addr) {
  51                node_sub->node = NULL;
  52                return;
  53        }
  54
  55        node_sub->node = tipc_node_find(addr);
  56        if (!node_sub->node) {
  57                warn("Node subscription rejected, unknown node 0x%x\n", addr);
  58                return;
  59        }
  60        node_sub->handle_node_down = handle_down;
  61        node_sub->usr_handle = usr_handle;
  62
  63        tipc_node_lock(node_sub->node);
  64        list_add_tail(&node_sub->nodesub_list, &node_sub->node->nsub);
  65        tipc_node_unlock(node_sub->node);
  66}
  67
  68/**
  69 * tipc_nodesub_unsubscribe - cancel "node down" subscription (if any)
  70 */
  71
  72void tipc_nodesub_unsubscribe(struct tipc_node_subscr *node_sub)
  73{
  74        if (!node_sub->node)
  75                return;
  76
  77        tipc_node_lock(node_sub->node);
  78        list_del_init(&node_sub->nodesub_list);
  79        tipc_node_unlock(node_sub->node);
  80}
  81